Self-adaptive chair back device and chair thereof

Abstract

The utility model belongs to the field of office furniture, and discloses a self-adaptive chair back device and a chair thereof, the self-adaptive chair back device comprises a chair back and a waist rest arranged on the front side of the chair back, the chair back is connected with the waist rest through a stretching mechanism, and the stretching mechanism pushes the waist rest forwards through stretching. The stretching mechanism comprises a first mounting seat, a connecting rod assembly, a telescopic driver, a second mounting seat and an elastic piece, the first mounting seat is connected with the chair back, the second mounting seat is connected with the waist rest, the rear end of the connecting rod assembly is rotationally connected with the first mounting seat, and the front end of the connecting rod assembly is rotationally connected with the second mounting seat; the telescopic driver drives the stretching mechanism to stretch, and the elastic piece acts on the second mounting seat, so that the lower end of the second mounting seat tends to rotate towards the front upper part. The stretching mechanism can drive the waist rest to stretch out, the waist rest is actively attached to and supports the waist of the human body, the waist rest can be attached to the waist of a user in a self-adaptive mode, and the experience feeling is better.

Description

Technical Field

[0001] The utility model relates to the field of office furniture, in particular to an adaptive backrest device and a seat thereof. Background Technique

[0002] In order to improve the user experience, lumbar supports are currently installed on the backrests of many office chairs. However, the existing lumbar supports generally have the following problems: the lumbar support cannot fully fit the human waist, and the experience is not good enough. Content of the Utility Model

[0003] The purpose of the utility model is to provide an adaptive backrest device and a seat thereof to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] An adaptive backrest device includes a backrest and a lumbar support arranged on the front side of the backrest. The backrest and the lumbar support are connected by an extension mechanism. The extension mechanism pushes the lumbar support forward through extension. The extension mechanism includes a first mounting seat, a connecting rod assembly, a telescopic driver, a second mounting seat and an elastic member. The first mounting seat is connected to the backrest, the second mounting seat is connected to the lumbar support. The rear end of the connecting rod assembly is rotatably connected to the first mounting seat, and the front end of the connecting rod assembly is rotatably connected to the second mounting seat. The telescopic driver drives the extension mechanism to extend, and the elastic member acts on the second mounting seat to make the lower end of the second mounting seat tend to rotate forward and upward.

[0006] Further, the second mounting seat is connected to the upper part of the lumbar support.

[0007] Further, the elastic member is a torsion spring.

[0008] Further, the connecting rod assembly and the second mounting seat are rotatably connected by a first pin shaft, and the torsion spring is sleeved on the first pin shaft.

[0009] Further, a first hinge seat is arranged between the connecting rod assembly and the second mounting seat. The first hinge seat and the second mounting seat are rotatably connected by a second pin shaft, and a first sliding groove is formed on the first hinge seat. The second pin shaft is slidably matched with the first sliding groove, and the first sliding groove is used to limit the rotation angle of the second mounting seat.

[0010] Further, the link assembly includes a first link, a second link, a third link, and a second hinge seat. The rear end of the first link is rotatably connected to the first mounting seat through a third pin shaft. The middle of the first link is rotatably connected to the second hinge seat through a fourth pin shaft. The front end of the first link is rotatably connected to the second link through a fifth pin shaft. A second chute is formed in the second hinge seat, and the fifth pin shaft is slidably engaged with the second chute. The second link is further rotatably connected to the middle of the third link through a sixth pin shaft. The lower end of the third link is rotatably connected to the second hinge seat, and the upper end of the third link is rotatably connected to the first hinge seat through a seventh pin shaft.

[0011] Further, the telescopic driver is a cylinder, one end of which is rotatably connected to the third pin shaft, and the other end is rotatably connected to the sixth pin shaft.

[0012] Further, the link assembly further includes a fourth link, which is arranged in parallel with the first link. The rear end of the fourth link is rotatably connected to the first mounting seat through an eighth pin shaft, and the front end of the fourth link is rotatably connected to the second hinge seat through a ninth pin shaft.

[0013] Further, the link assembly further includes a fifth link, which is arranged in parallel with the third link. The upper end of the fifth link is rotatably connected to the first hinge seat through a tenth pin shaft, and the lower end of the fifth link is rotatably connected to the second hinge seat through an eleventh pin shaft.

[0014] The present utility model further provides a seat, which includes the adaptive backrest device as described above.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model can drive the lumbar support to extend through the extension mechanism, actively fit and support the human waist, and the lumbar support can also adaptively fit the waist of the user, providing a better experience. Description of the Drawings

[0016] Figure 1 It is one of the structural schematic diagrams of the present utility model.

[0017] Figure 2 It is the second structural schematic diagram of the present utility model.

[0018] Figure 3 It is the exploded structural schematic diagram of the present utility model.

[0019] Figure 4 It is the structural schematic diagram of the extension mechanism in the present utility model.

[0020] Figure 5 It is the structural schematic diagram of the first hinge seat in the present utility model.

[0021] Figure 6 It is the structural schematic diagram of the second hinge seat in the present utility model.

[0022] In the figure: chair back 1, lumbar support 2, first mounting seat 3, air cylinder 4, second mounting seat 5, torsion spring 6, first pin shaft 7, second pin shaft 8, third pin shaft 9, fourth pin shaft 10, fifth pin shaft 11, sixth pin shaft 12, seventh pin shaft 13, eighth pin shaft 14, ninth pin shaft 15, tenth pin shaft 16, eleventh pin shaft 17, first hinge seat 18, second hinge seat 19, first connecting rod 20, second connecting rod 21, third connecting rod 22, fourth connecting rod 23, fifth connecting rod 24, twelfth pin shaft 25. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1 - 6 , an adaptive chair back device, including a chair back 1 and a lumbar support 2 arranged on the front side of the chair back 1. The chair back 1 and the lumbar support 2 are connected by an extension mechanism. The extension mechanism pushes the lumbar support 2 forward through extension. The extension mechanism includes a first mounting seat 3, a connecting rod assembly, a telescopic driver, a second mounting seat 5 and an elastic member. The first mounting seat 3 is connected to the chair back 1, the second mounting seat 5 is connected to the lumbar support 2, the rear end of the connecting rod assembly is rotatably connected to the first mounting seat 3, the front end of the connecting rod assembly is rotatably connected to the second mounting seat 5, the telescopic driver drives the extension mechanism to extend, and the elastic member acts on the second mounting seat 5 to make the lower end of the second mounting seat 5 tend to rotate forward and upward.

[0025] Continue to refer to Figure 2 , in an embodiment of the present invention, the second mounting seat 5 is connected to the upper part of the lumbar support 2.

[0026] Continue to refer to Figure 4 , in an embodiment of the present invention, the elastic member is a torsion spring 6. The connecting rod assembly and the second mounting seat 5 are rotatably connected through a first pin shaft 7, and the torsion spring 6 is sleeved on the first pin shaft 7.

[0027] Continue to refer to Figure 4 and Figure 5 , in an embodiment of the present invention, a first hinge seat 18 is arranged between the connecting rod assembly and the second mounting seat 5. The first hinge seat 18 and the second mounting seat 5 are rotatably connected through a second pin shaft 8, and a first sliding groove 1800 is formed on the first hinge seat 18. The second pin shaft 8 is slidably matched with the first sliding groove 1800, and the first sliding groove 1800 is used to limit the rotation angle of the second mounting seat 5.

[0028] Further refer toFigure 4 and Figure 6 , in an embodiment of the present utility model, the connecting rod assembly includes a first connecting rod 20, a second connecting rod 21, a third connecting rod 22 and a second hinge seat 19. The first connecting rod 20, the second connecting rod 21 and the third connecting rod 22 are all arranged in pairs. The rear ends of the two first connecting rods 20 are rotatably connected to the first mounting seat 3 through a third pin shaft 9. The middle parts of the two first connecting rods 20 and the second hinge seat 19 are rotatably connected through a fourth pin shaft 10. The front ends of the two first connecting rods 20 and the second connecting rod 21 are rotatably connected through a fifth pin shaft 11. Second sliding grooves 1900 are opened on both the left and right sides of the second hinge seat 19. The two ends of the fifth pin shaft 11 are slidably matched with the corresponding second sliding grooves 1900. The two second connecting rods 21 are also rotatably connected to the middle parts of the two third connecting rods 22 through a sixth pin shaft 12. The lower ends of the two third connecting rods 22 and the second hinge seat 19 are rotatably connected through a twelfth pin shaft 25. The upper ends of the two third connecting rods 22 and the first hinge seat 18 are rotatably connected through a seventh pin shaft 13. The telescopic driver is preferably a cylinder 4, one end of which is rotatably connected to the third pin shaft 9 and the other end is rotatably connected to the sixth pin shaft 12.

[0029] For further reference Figure 4 and Figure 6 , in an embodiment of the present utility model, the connecting rod assembly further includes two fourth connecting rods 23 arranged in pairs and two fifth connecting rods 24 arranged in pairs. The fourth connecting rods 23 are arranged in parallel with the first connecting rods 20. The rear ends of the two fourth connecting rods 23 are rotatably connected to the first mounting seat 3 through an eighth pin shaft 14. The front ends of the two fourth connecting rods 23 and the second hinge seat 19 are rotatably connected through a ninth pin shaft 15. The fifth connecting rods 24 are arranged in parallel with the third connecting rods 22. The upper ends of the two fifth connecting rods 24 and the first hinge seat 18 are rotatably connected through a tenth pin shaft 16. The lower ends of the two fifth connecting rods 24 and the second hinge seat 19 are rotatably connected through an eleventh pin shaft 17.

[0030] It should be noted that the above technical term "middle part" refers to the part of the connecting rod except its two ends, not exactly the central part of the connecting rod.

[0031] As Figure 4 shown, when the extension mechanism works, the cylinder 4 drives the sixth pin shaft 12 to move forward, drives the third connecting rod 22 and the second connecting rod 21 to move forward through the sixth pin shaft 12, and the third connecting rod 22 also drives the second mounting seat 5 to move forward through the first hinge seat 18, so as to realize the elongation of the extension mechanism.

[0032] When the user is sitting at work, generally speaking, the upper body will lean forward slightly. Under the action of the torsion spring 6, the lower end of the lumbar support 2 of the present utility model leans slightly forward. The present utility model pushes the lumbar support 2 forward through the extension mechanism. The lower end of the lumbar support 2 will first come into contact with the user's waist. After the lower end of the lumbar support 2 encounters resistance, it can overcome the elastic force of the torsion spring 6 and rotate backward to fit the human waist. Then the extension mechanism further pushes the lumbar support 2 forward, causing the lumbar support 2 to rotate clockwise, that is, the upper end of the lumbar support 2 rotates forward, so that the upper end of the lumbar support 2 also comes into contact with the user's waist, thereby making the lumbar support 2 fit the user's waist as much as possible. As the user's posture changes, driven by the extension mechanism, the lumbar support 2 will adaptively fit the user's waist. Among them, the cylinder 4 is a one-way cylinder, and the user can make the lumbar support 2 reset backward by leaning back.

[0033] The present utility model also provides a seat, including the adaptive backrest device as described above.

[0034] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An adaptive chair back device, comprising a chair back (1) and a lumbar support (2) arranged on the front side of the chair back (1), characterized in that: The chair back (1) and the lumbar support (2) are connected via an extension mechanism, and the extension mechanism pushes the lumbar support (2) forward by extension. The extension mechanism comprises a first mounting seat (3), a connecting rod assembly, a telescopic driver, a second mounting seat (5) and an elastic member. The first mounting seat (3) is connected to the chair back (1), and the second mounting seat (5) is connected to the lumbar support (2). The rear end of the connecting rod assembly is rotatably connected to the first mounting seat (3), and the front end of the connecting rod assembly is rotatably connected to the second mounting seat (5). The telescopic driver drives the extension mechanism to extend, and the elastic member acts on the second mounting seat (5) to cause the lower end of the second mounting seat (5) to rotate forward and upward.

2. The adaptive seat back device according to claim 1, characterized in that: The second mounting seat (5) is connected to the upper part of the lumbar support (2).

3. The adaptive seat back device according to claim 1, characterized in that: The elastic member is a torsion spring (6).

4. The adaptive seat back device according to claim 3, characterized in that: The connecting rod assembly and the second mounting seat (5) are rotatably connected via a first pin shaft (7), and the torsion spring (6) is sleeved on the first pin shaft (7).

5. The adaptive seat back device according to claim 4, characterized in that: A first hinge seat (18) is arranged between the connecting rod assembly and the second mounting seat (5); the first hinge seat (18) and the second mounting seat (5) are rotatably connected via a second pin shaft (8); a first slide groove (1800) is provided on the first hinge seat (18); the first slide groove (1800) is slidably matched with the second pin shaft (8); and the first slide groove (1800) is used to limit the rotation angle of the second mounting seat (5).

6. The adaptive seat back device according to claim 5, characterized in that: The connecting rod assembly comprises a first connecting rod (20), a second connecting rod (21), a third connecting rod (22) and a second hinge seat (19). The rear end of the first connecting rod (20) is rotatably connected to the first mounting seat (3) through a third pin shaft (9). The middle part of the first connecting rod (20) is rotatably connected to the second hinge seat (19) through a fourth pin shaft (10). The front end of the first connecting rod (20) is rotatably connected to the second connecting rod (21) through a fifth pin shaft (11). The second hinge seat (19) is provided with a second slide groove (1900). The fifth pin shaft (11) is slidably matched with the second slide groove (1900). The second connecting rod (21) is also rotatably connected to the middle part of the third connecting rod (22) through a sixth pin shaft (12). The lower end of the third connecting rod (22) is rotatably connected to the second hinge seat (19). The upper end of the third connecting rod (22) is rotatably connected to the first hinge seat (18) through a seventh pin shaft (13).

7. The adaptive seat back device according to claim 6, characterized in that: The telescopic driver is a cylinder (4), one end of which is rotatably connected to the third pin shaft (9), and the other end of which is rotatably connected to the sixth pin shaft (12).

8. The adaptive seat back device according to claim 6, characterized in that: The connecting rod assembly also includes a fourth connecting rod (23), which is arranged parallel to the first connecting rod (20), the rear end of the fourth connecting rod (23) is rotatably connected to the first mounting seat (3) via an eighth pin shaft (14), and the front end of the fourth connecting rod (23) is rotatably connected to the second hinge seat (19) via a ninth pin shaft (15).

9. The adaptive seat back device according to claim 6, characterized in that: The connecting rod assembly also includes a fifth connecting rod (24), which is arranged in parallel with the third connecting rod (22), the upper end of the fifth connecting rod (24) is rotatably connected to the first hinge seat (18) via a tenth pin shaft (16), and the lower end of the fifth connecting rod (24) is rotatably connected to the second hinge seat (19) via an eleventh pin shaft (17).

10. A seat, characterized in that: It comprises the adaptive seat back device as claimed in any one of claims 1-9.

Images